Adds a parameter for the timestamp server url

I was having trouble with the default timeserver and wanted to be able
to use others. Particularly, the server that the vendor of my cert
recommends.

Also adds missing parameters to action.yml

build release

build release

Hard code timestamp server

Hard code timestamp server

Adds a parameter for the timestamp server url

I was having trouble with the default timeserver and wanted to be able
to use others. Particularly, the server that the vendor of my cert
recommends.

Actual release

Actual release

Completed Action

Updated documentation due to support for more files.